A simple ptrace-based debugger

Let's look at a code example that makes use of ptrace to create a debugger program:

#include <stdio.h> #include <string.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> #include <errno.h> #include <signal.h> #include <elf.h> #include <sys/types.h> #include <sys/user.h> #include <sys/stat.h> #include <sys/ptrace.h> #include <sys/mman.h> typedef struct handle { Elf64_Ehdr *ehdr; Elf64_Phdr *phdr; Elf64_Shdr *shdr; uint8_t *mem; char *symname; Elf64_Addr symaddr; struct user_regs_struct pt_reg; char *exec; } handle_t; Elf64_Addr lookup_symbol(handle_t *, const char *); int main(int argc, char **argv, char **envp) { int fd; handle_t h; struct stat st; long trap, orig; int status, pid; char * args[2]; if (argc ...

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